HTTP Authentication lets you make a site without letting anyone view it without valid credentials. This can protect the full site or only admin pages.

KIMoFy

The HTTP Authentication plugin allows you to use existing means of authenticating people to WordPress. This includes Apache’s basic HTTP authentication module, which most servers use.
This plugin works the same way web servers would handle password protection, but in this case, WordPress handles everything.
Ordered list:
<ol>
<li>Password protect a website currently in development.</li>
<li>Secure all admin pages.</li>
<li>Deny access to unauthorized visitors.</li>
</ol>

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